1 files changed, 903 insertions, 0 deletions

diff --git a/c/src/libnetworking/pppd/rtemsmain.c b/c/src/libnetworking/pppd/rtemsmain.c
new file mode 100644
index 0000000000..5a266a9ff3
--- /dev/null
+++ b/c/src/libnetworking/pppd/rtemsmain.c
@@ -0,0 +1,903 @@
+/*
+ * main.c - Point-to-Point Protocol main module
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#define RCSID	"$Id$"
+
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <setjmp.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <rtems.h>
+#include <rtems/rtems_bsdnet.h>
+extern void rtems_bsdnet_semaphore_obtain(void);
+extern void rtems_bsdnet_semaphore_release(void);
+extern int  chatmain(char *argv);
+
+#include "pppd.h"
+#include "magic.h"
+#include "fsm.h"
+#include "lcp.h"
+#include "ipcp.h"
+#ifdef INET6
+#include "ipv6cp.h"
+#endif
+#include "upap.h"
+#include "chap.h"
+#include "ccp.h"
+#include "pathnames.h"
+#include "patchlevel.h"
+
+#ifdef CBCP_SUPPORT
+#include "cbcp.h"
+#endif
+
+#ifdef IPX_CHANGE
+#include "ipxcp.h"
+#endif /* IPX_CHANGE */
+#ifdef AT_CHANGE
+#include "atcp.h"
+#endif
+
+static const char rcsid[] = RCSID;
+
+/* interface vars */
+char ifname[32];		/* Interface name */
+int pppifunit;			/* Interface unit number */
+
+char *progname;			/* Name of this program */
+char hostname[MAXNAMELEN];	/* Our hostname */
+static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
+
+int ttyfd;			/* Serial port file descriptor */
+int baud_rate;			/* Actual bits/second for serial device */
+int hungup;			/* terminal has been hung up */
+int privileged;			/* we're running as real uid root */
+int need_holdoff;		/* need holdoff period before restarting */
+int detached;			/* have detached from terminal */
+struct stat devstat;		/* result of stat() on devnam */
+int prepass = 0;		/* doing prepass to find device name */
+int devnam_fixed;		/* set while in options.ttyxx file */
+volatile int status;		/* exit status for pppd */
+int unsuccess;			/* # unsuccessful connection attempts */
+int do_callback;		/* != 0 if we should do callback next */
+int doing_callback;		/* != 0 if we are doing callback */
+char *callback_script;		/* script for doing callback */
+
+int (*holdoff_hook) __P((void)) = NULL;
+int (*new_phase_hook) __P((int)) = NULL;
+
+static int fd_ppp = -1;		/* fd for talking PPP */
+static int pty_master;		/* fd for master side of pty */
+static int pty_slave;		/* fd for slave side of pty */
+static int real_ttyfd;		/* fd for actual serial port (not pty) */
+
+int phase;			/* where the link is at */
+int kill_link;
+int open_ccp_flag;
+
+static int waiting;
+
+char **script_env;		/* Env. variable values for scripts */
+int s_env_nalloc;		/* # words avail at script_env */
+
+u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
+u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
+
+char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
+
+static struct timeval start_time;	/* Time when link was started. */
+
+struct pppd_stats link_stats;
+int link_connect_time;
+int link_stats_valid;
+
+/* Prototypes for procedures local to this file. */
+
+static void cleanup __P((void));
+static void close_tty __P((void));
+static void get_input __P((void));
+static void calltimeout __P((void));
+static struct timeval *timeleft __P((struct timeval *));
+static void holdoff_end __P((void *));
+static int device_script __P((char *, int, int, int));
+
+extern	char	*ttyname __P((int));
+extern	char	*getlogin __P((void));
+int pppdmain __P((int, char *[]));
+
+/*
+ * PPP Data Link Layer "protocol" table.
+ * One entry per supported protocol.
+ * The last entry must be NULL.
+ */
+struct protent *protocols[] = {
+    &lcp_protent,
+    &pap_protent,
+    &chap_protent,
+#ifdef CBCP_SUPPORT
+    &cbcp_protent,
+#endif
+    &ipcp_protent,
+#ifdef INET6
+    &ipv6cp_protent,
+#endif
+    &ccp_protent,
+#ifdef IPX_CHANGE
+    &ipxcp_protent,
+#endif
+#ifdef AT_CHANGE
+    &atcp_protent,
+#endif
+    NULL
+};
+
+int
+pppdmain(argc, argv)
+    int argc;
+    char *argv[];
+{
+    int i, fdflags, t;
+    char *connector;
+    struct timeval timo;
+    struct protent *protp;
+
+    new_phase(PHASE_INITIALIZE);
+
+    script_env = NULL;
+    hostname[MAXNAMELEN-1] = 0;
+    privileged = 1;
+    privileged_option = 1;
+
+    /*
+     * Initialize magic number generator now so that protocols may
+     * use magic numbers in initialization.
+     */
+    magic_init();
+
+#ifdef XXX_XXX
+    /* moved code the the rtems_pppd_reset_options function */
+
+    /*
+     * Initialize to the standard option set, then parse, in order,
+     * the system options file, the user's options file,
+     * the tty's options file, and the command line arguments.
+     */
+    for (i = 0; (protp = protocols[i]) != NULL; ++i)
+        (*protp->init)(0);
+#endif
+
+    progname = *argv;
+
+
+    if (!ppp_available()) {
+	option_error(no_ppp_msg);
+	return(EXIT_NO_KERNEL_SUPPORT);
+    }
+
+    /*
+     * Check that the options given are valid and consistent.
+     */
+    if (!sys_check_options()) {
+	return(EXIT_OPTION_ERROR);
+    }
+    if (!auth_check_options()) {
+	return(EXIT_OPTION_ERROR);
+    }
+    for (i = 0; (protp = protocols[i]) != NULL; ++i)
+	if (protp->check_options != NULL)
+	    (*protp->check_options)();
+
+    /* default holdoff to 0 if no connect script has been given */
+    if (connect_script == 0 && !holdoff_specified)
+	holdoff = 0;
+
+    if (default_device)
+	nodetach = 1;
+
+    /*
+     * Initialize system-dependent stuff.
+     */
+    sys_init();
+    /* if (debug)
+	setlogmask(LOG_UPTO(LOG_DEBUG));
+    */
+
+    waiting = 0;
+
+    do_callback = 0;
+    for (;;) {
+
+	need_holdoff = 1;
+	ttyfd = -1;
+	real_ttyfd = -1;
+	status = EXIT_OK;
+	++unsuccess;
+	doing_callback = do_callback;
+	do_callback = 0;
+
+	new_phase(PHASE_SERIALCONN);
+
+	/*
+	 * Get a pty master/slave pair if the pty, notty, or record
+	 * options were specified.
+	 */
+	strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
+	pty_master = -1;
+	pty_slave = -1;
+
+	/*
+	 * Open the serial device and set it up to be the ppp interface.
+	 * First we open it in non-blocking mode so we can set the
+	 * various termios flags appropriately.  If we aren't dialling
+	 * out and we want to use the modem lines, we reopen it later
+	 * in order to wait for the carrier detect signal from the modem.
+	 */
+	hungup = 0;
+	kill_link = 0;
+	connector = doing_callback? callback_script: connect_script;
+	if (devnam[0] != 0) {
+	    for (;;) {
+		/* If the user specified the device name, become the
+		   user before opening it. */
+		int err;
+		ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
+		err = errno;
+		if (ttyfd >= 0) {
+		    break;
+		}
+		errno = err;
+		if (err != EINTR) {
+		    error("Failed to open %s: %m", devnam);
+		    status = EXIT_OPEN_FAILED;
+		}
+		if (!persist || err != EINTR)
+		    goto fail;
+	    }
+	    if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
+		|| fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
+		warn("Couldn't reset non-blocking mode on device: %m");
+
+	    /*
+	     * Set line speed, flow control, etc.
+	     * If we have a non-null connection or initializer script,
+	     * on most systems we set CLOCAL for now so that we can talk
+	     * to the modem before carrier comes up.  But this has the
+	     * side effect that we might miss it if CD drops before we
+	     * get to clear CLOCAL below.  On systems where we can talk
+	     * successfully to the modem with CLOCAL clear and CD down,
+	     * we could clear CLOCAL at this point.
+	     */
+	    set_up_tty(ttyfd, ((connector != NULL && connector[0] != 0)
+			       || initializer != NULL));
+	    real_ttyfd = ttyfd;
+	}
+
+	/* run connection script */
+	if ((connector && connector[0]) || initializer) {
+	    if (real_ttyfd != -1) {
+		/* XXX do this if doing_callback == CALLBACK_DIALIN? */
+		if (!default_device && modem) {
+		    setdtr(real_ttyfd, 0);	/* in case modem is off hook */
+		    sleep(1);
+		    setdtr(real_ttyfd, 1);
+		}
+	    }
+
+	    if (initializer && initializer[0]) {
+		if (device_script(initializer, ttyfd, ttyfd, 0) < 0) {
+		    error("Initializer script failed");
+		    status = EXIT_INIT_FAILED;
+		    goto fail;
+		}
+		if (kill_link)
+		    goto disconnect;
+
+		info("Serial port initialized.");
+	    }
+
+	    if (connector && connector[0]) {
+		if (device_script(connector, ttyfd, ttyfd, 0) < 0) {
+		    error("Connect script failed");
+		    status = EXIT_CONNECT_FAILED;
+		    goto fail;
+		}
+		if (kill_link)
+		    goto disconnect;
+
+		info("Serial connection established.");
+	    }
+
+	    /* set line speed, flow control, etc.;
+	       clear CLOCAL if modem option */
+	    if (real_ttyfd != -1)
+		set_up_tty(real_ttyfd, 0);
+
+	    if (doing_callback == CALLBACK_DIALIN)
+		connector = NULL;
+	}
+
+	/* reopen tty if necessary to wait for carrier */
+	if (connector == NULL && modem && devnam[0] != 0) {
+	    for (;;) {
+		if ((i = open(devnam, O_RDWR)) >= 0)
+		    break;
+		if (errno != EINTR) {
+		    error("Failed to reopen %s: %m", devnam);
+		    status = EXIT_OPEN_FAILED;
+		}
+		if (!persist || errno != EINTR || hungup || kill_link)
+		    goto fail;
+	    }
+	    close(i);
+	}
+
+        info("Serial connection established.");
+        sleep(1);
+
+	/* run welcome script, if any */
+	if (welcomer && welcomer[0]) {
+	    if (device_script(welcomer, ttyfd, ttyfd, 0) < 0)
+		warn("Welcome script failed");
+	}
+
+	/* set up the serial device as a ppp interface */
+	fd_ppp = establish_ppp(ttyfd);
+	if (fd_ppp < 0) {
+	    status = EXIT_FATAL_ERROR;
+	    goto disconnect;
+	}
+
+	if (!demand) {
+	    info("Using interface ppp%d", pppifunit);
+	    slprintf(ifname, sizeof(ifname), "ppp%d", pppifunit);
+	}
+
+	/*
+	 * Start opening the connection and wait for
+	 * incoming events (reply, timeout, etc.).
+	 */
+	notice("Connect: %s <--> %s", ifname, ppp_devnam);
+	gettimeofday(&start_time, NULL);
+
+	rtems_bsdnet_semaphore_obtain();
+	lcp_lowerup(0);
+	lcp_open(0);		/* Start protocol */
+	rtems_bsdnet_semaphore_release();
+
+	open_ccp_flag = 0;
+	status = EXIT_NEGOTIATION_FAILED;
+	new_phase(PHASE_ESTABLISH);
+	while (phase != PHASE_DEAD) {
+	    waiting = 1;
+   	    wait_input(timeleft(&timo));
+	    waiting = 0;
+
+	    calltimeout();
+	    get_input();
+	    if (kill_link) {
+		lcp_close(0, "User request");
+		kill_link = 0;
+	    }
+	    if (open_ccp_flag) {
+		if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
+		    ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
+		    (*ccp_protent.open)(0);
+		}
+		open_ccp_flag = 0;
+	    }
+	}
+
+	/*
+	 * If we may want to bring the link up again, transfer
+	 * the ppp unit back to the loopback.  Set the
+	 * real serial device back to its normal mode of operation.
+	 */
+	clean_check();
+	if (demand)
+	    restore_loop();
+	disestablish_ppp(ttyfd);
+	fd_ppp = -1;
+	if (!hungup)
+	    lcp_lowerdown(0);
+
+	/*
+	 * Run disconnector script, if requested.
+	 * XXX we may not be able to do this if the line has hung up!
+	 */
+    disconnect:
+	if (disconnect_script && !hungup) {
+	    new_phase(PHASE_DISCONNECT);
+	    if (real_ttyfd >= 0)
+		set_up_tty(real_ttyfd, 1);
+	    if (device_script(disconnect_script, ttyfd, ttyfd, 0) < 0) {
+		warn("disconnect script failed");
+	    } else {
+		info("Serial link disconnected.");
+	    }
+	}
+
+    fail:
+	if (pty_master >= 0)
+	    close(pty_master);
+	if (pty_slave >= 0)
+	    close(pty_slave);
+	if (real_ttyfd >= 0)
+	    close_tty();
+
+	if (!persist || (maxfail > 0 && unsuccess >= maxfail))
+	    break;
+
+	kill_link = 0;
+	if (demand)
+	    demand_discard();
+	t = need_holdoff? holdoff: 0;
+	if (holdoff_hook)
+	    t = (*holdoff_hook)();
+	if (t > 0) {
+	    new_phase(PHASE_HOLDOFF);
+	    TIMEOUT(holdoff_end, NULL, t);
+	    do {
+	        waiting = 1;
+   	        wait_input(timeleft(&timo));
+	        waiting = 0;
+
+		calltimeout();
+		if (kill_link) {
+		    kill_link = 0;
+		    new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
+		}
+	    } while (phase == PHASE_HOLDOFF);
+	    if (!persist)
+		break;
+	}
+    }
+
+    die(status);
+    return 0;
+}
+
+/*
+ * holdoff_end - called via a timeout when the holdoff period ends.
+ */
+static void
+holdoff_end(arg)
+    void *arg;
+{
+    new_phase(PHASE_DORMANT);
+}
+
+/* List of protocol names, to make our messages a little more informative. */
+struct protocol_list {
+    u_short	proto;
+    const char	*name;
+} protocol_list[] = {
+    { 0x21,	"IP" },
+    { 0x23,	"OSI Network Layer" },
+    { 0x25,	"Xerox NS IDP" },
+    { 0x27,	"DECnet Phase IV" },
+    { 0x29,	"Appletalk" },
+    { 0x2b,	"Novell IPX" },
+    { 0x2d,	"VJ compressed TCP/IP" },
+    { 0x2f,	"VJ uncompressed TCP/IP" },
+    { 0x31,	"Bridging PDU" },
+    { 0x33,	"Stream Protocol ST-II" },
+    { 0x35,	"Banyan Vines" },
+    { 0x39,	"AppleTalk EDDP" },
+    { 0x3b,	"AppleTalk SmartBuffered" },
+    { 0x3d,	"Multi-Link" },
+    { 0x3f,	"NETBIOS Framing" },
+    { 0x41,	"Cisco Systems" },
+    { 0x43,	"Ascom Timeplex" },
+    { 0x45,	"Fujitsu Link Backup and Load Balancing (LBLB)" },
+    { 0x47,	"DCA Remote Lan" },
+    { 0x49,	"Serial Data Transport Protocol (PPP-SDTP)" },
+    { 0x4b,	"SNA over 802.2" },
+    { 0x4d,	"SNA" },
+    { 0x4f,	"IP6 Header Compression" },
+    { 0x6f,	"Stampede Bridging" },
+    { 0xfb,	"single-link compression" },
+    { 0xfd,	"1st choice compression" },
+    { 0x0201,	"802.1d Hello Packets" },
+    { 0x0203,	"IBM Source Routing BPDU" },
+    { 0x0205,	"DEC LANBridge100 Spanning Tree" },
+    { 0x0231,	"Luxcom" },
+    { 0x0233,	"Sigma Network Systems" },
+    { 0x8021,	"Internet Protocol Control Protocol" },
+    { 0x8023,	"OSI Network Layer Control Protocol" },
+    { 0x8025,	"Xerox NS IDP Control Protocol" },
+    { 0x8027,	"DECnet Phase IV Control Protocol" },
+    { 0x8029,	"Appletalk Control Protocol" },
+    { 0x802b,	"Novell IPX Control Protocol" },
+    { 0x8031,	"Bridging NCP" },
+    { 0x8033,	"Stream Protocol Control Protocol" },
+    { 0x8035,	"Banyan Vines Control Protocol" },
+    { 0x803d,	"Multi-Link Control Protocol" },
+    { 0x803f,	"NETBIOS Framing Control Protocol" },
+    { 0x8041,	"Cisco Systems Control Protocol" },
+    { 0x8043,	"Ascom Timeplex" },
+    { 0x8045,	"Fujitsu LBLB Control Protocol" },
+    { 0x8047,	"DCA Remote Lan Network Control Protocol (RLNCP)" },
+    { 0x8049,	"Serial Data Control Protocol (PPP-SDCP)" },
+    { 0x804b,	"SNA over 802.2 Control Protocol" },
+    { 0x804d,	"SNA Control Protocol" },
+    { 0x804f,	"IP6 Header Compression Control Protocol" },
+    { 0x006f,	"Stampede Bridging Control Protocol" },
+    { 0x80fb,	"Single Link Compression Control Protocol" },
+    { 0x80fd,	"Compression Control Protocol" },
+    { 0xc021,	"Link Control Protocol" },
+    { 0xc023,	"Password Authentication Protocol" },
+    { 0xc025,	"Link Quality Report" },
+    { 0xc027,	"Shiva Password Authentication Protocol" },
+    { 0xc029,	"CallBack Control Protocol (CBCP)" },
+    { 0xc081,	"Container Control Protocol" },
+    { 0xc223,	"Challenge Handshake Authentication Protocol" },
+    { 0xc281,	"Proprietary Authentication Protocol" },
+    { 0,	NULL },
+};
+
+/*
+ * protocol_name - find a name for a PPP protocol.
+ */
+const char *
+protocol_name(proto)
+    int proto;
+{
+    struct protocol_list *lp;
+
+    for (lp = protocol_list; lp->proto != 0; ++lp)
+	if (proto == lp->proto)
+	    return lp->name;
+    return NULL;
+}
+
+/*
+ * get_input - called when incoming data is available.
+ */
+static void
+get_input()
+{
+    int len, i;
+    u_char *p;
+    u_short protocol;
+    struct protent *protp;
+
+    p = inpacket_buf;	/* point to beginning of packet buffer */
+
+    len = read_packet(inpacket_buf);
+    if (len < 0)
+	return;
+
+    if (len == 0) {
+	notice("Modem hangup");
+	hungup = 1;
+	status = EXIT_HANGUP;
+	lcp_lowerdown(0);	/* serial link is no longer available */
+	link_terminated(0);
+	return;
+    }
+
+    if (debug /*&& (debugflags & DBG_INPACKET)*/)
+	dbglog("rcvd %P", p, len);
+
+    if (len < PPP_HDRLEN) {
+	MAINDEBUG(("io(): Received short packet."));
+	return;
+    }
+
+    rtems_bsdnet_semaphore_obtain();
+    p += 2;				/* Skip address and control */
+    GETSHORT(protocol, p);
+    len -= PPP_HDRLEN;
+
+    /*
+     * Toss all non-LCP packets unless LCP is OPEN.
+     */
+    if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
+	MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
+        rtems_bsdnet_semaphore_release();
+	return;
+    }
+
+    /*
+     * Until we get past the authentication phase, toss all packets
+     * except LCP, LQR and authentication packets.
+     */
+    if (phase <= PHASE_AUTHENTICATE
+	&& !(protocol == PPP_LCP || protocol == PPP_LQR
+	     || protocol == PPP_PAP || protocol == PPP_CHAP)) {
+	MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
+		   protocol, phase));
+        rtems_bsdnet_semaphore_release();
+	return;
+    }
+
+    /*
+     * Upcall the proper protocol input routine.
+     */
+    for (i = 0; (protp = protocols[i]) != NULL; ++i) {
+	if (protp->protocol == protocol && protp->enabled_flag) {
+	    (*protp->input)(0, p, len);
+            rtems_bsdnet_semaphore_release();
+	    return;
+	}
+        if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
+	    && protp->datainput != NULL) {
+	    (*protp->datainput)(0, p, len);
+            rtems_bsdnet_semaphore_release();
+	    return;
+	}
+    }
+
+    if (debug) {
+	const char *pname = protocol_name(protocol);
+	if (pname != NULL)
+	    warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
+	else
+	    warn("Unsupported protocol 0x%x received", protocol);
+    }
+    lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
+    rtems_bsdnet_semaphore_release();
+}
+
+/*
+ * new_phase - signal the start of a new phase of pppd's operation.
+ */
+void
+new_phase(p)
+    int p;
+{
+    phase = p;
+    if (new_phase_hook)
+	(*new_phase_hook)(p);
+}
+
+/*
+ * die - clean up state and exit with the specified status.
+ */
+void
+die(status)
+    int status;
+{
+    cleanup();
+}
+
+/*
+ * cleanup - restore anything which needs to be restored before we exit
+ */
+/* ARGSUSED */
+static void
+cleanup()
+{
+    sys_cleanup();
+
+    if (fd_ppp >= 0)
+	disestablish_ppp(ttyfd);
+    if (real_ttyfd >= 0)
+	close_tty();
+
+    sys_close();
+}
+
+/*
+ * close_tty - restore the terminal device and close it.
+ */
+static void
+close_tty()
+{
+    /* drop dtr to hang up */
+    if (!default_device && modem) {
+	setdtr(real_ttyfd, 0);
+	/*
+	 * This sleep is in case the serial port has CLOCAL set by default,
+	 * and consequently will reassert DTR when we close the device.
+	 */
+	sleep(1);
+    }
+
+    restore_tty(real_ttyfd);
+
+    close(real_ttyfd);
+    real_ttyfd = -1;
+}
+
+/*
+ * update_link_stats - get stats at link termination.
+ */
+void
+update_link_stats(u)
+    int u;
+{
+    struct timeval now;
+    char numbuf[32];
+
+    if (!get_ppp_stats(u, &link_stats)
+	|| gettimeofday(&now, NULL) < 0)
+	return;
+    link_connect_time = now.tv_sec - start_time.tv_sec;
+    link_stats_valid = 1;
+
+    slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
+    slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
+    slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
+}
+
+struct	callout {
+    struct timeval	c_time;		/* time at which to call routine */
+    void		*c_arg;		/* argument to routine */
+    void		(*c_func) __P((void *)); /* routine */
+    struct		callout *c_next;
+};
+
+static struct callout *callout = NULL;	/* Callout list */
+static struct timeval timenow;		/* Current time */
+
+/*
+ * timeout - Schedule a timeout.
+ *
+ * Note that this timeout takes the number of seconds, NOT hz (as in
+ * the kernel).
+ */
+void
+ppptimeout(func, arg, time)
+    void (*func) __P((void *));
+    void *arg;
+    int time;
+{
+    struct callout *newp, *p, **pp;
+  
+    MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
+  
+    /*
+     * Allocate timeout.
+     */
+    if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
+	fatal("Out of memory in timeout()!");
+    newp->c_arg = arg;
+    newp->c_func = func;
+    gettimeofday(&timenow, NULL);
+    newp->c_time.tv_sec = timenow.tv_sec + time;
+    newp->c_time.tv_usec = timenow.tv_usec;
+  
+    /*
+     * Find correct place and link it in.
+     */
+    for (pp = &callout; (p = *pp); pp = &p->c_next)
+	if (newp->c_time.tv_sec < p->c_time.tv_sec
+	    || (newp->c_time.tv_sec == p->c_time.tv_sec
+		&& newp->c_time.tv_usec < p->c_time.tv_usec))
+	    break;
+    newp->c_next = p;
+    *pp = newp;
+}
+
+
+/*
+ * untimeout - Unschedule a timeout.
+ */
+void
+untimeout(func, arg)
+    void (*func) __P((void *));
+    void *arg;
+{
+    struct callout **copp, *freep;
+  
+    MAINDEBUG(("Untimeout %p:%p.", func, arg));
+  
+    /*
+     * Find first matching timeout and remove it from the list.
+     */
+    for (copp = &callout; (freep = *copp); copp = &freep->c_next)
+	if (freep->c_func == func && freep->c_arg == arg) {
+	    *copp = freep->c_next;
+	    free((char *) freep);
+	    break;
+	}
+}
+
+
+/*
+ * calltimeout - Call any timeout routines which are now due.
+ */
+static void
+calltimeout()
+{
+    struct callout *p;
+
+    while (callout != NULL) {
+	p = callout;
+
+	if (gettimeofday(&timenow, NULL) < 0)
+	    fatal("Failed to get time of day: %m");
+	if (!(p->c_time.tv_sec < timenow.tv_sec
+	      || (p->c_time.tv_sec == timenow.tv_sec
+		  && p->c_time.tv_usec <= timenow.tv_usec)))
+	    break;		/* no, it's not time yet */
+
+	callout = p->c_next;
+	(*p->c_func)(p->c_arg);
+
+	free((char *) p);
+    }
+}
+
+
+/*
+ * timeleft - return the length of time until the next timeout is due.
+ */
+static struct timeval *
+timeleft(tvp)
+    struct timeval *tvp;
+{
+    if (callout == NULL)
+	return NULL;
+
+    gettimeofday(&timenow, NULL);
+    tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
+    tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
+    if (tvp->tv_usec < 0) {
+	tvp->tv_usec += 1000000;
+	tvp->tv_sec -= 1;
+    }
+    if (tvp->tv_sec < 0)
+	tvp->tv_sec = tvp->tv_usec = 0;
+
+    return tvp;
+}
+
+/*
+ * device_script - run a program to talk to the serial device
+ * (e.g. to run the connector or disconnector script).
+ */
+static int
+device_script(program, in, out, dont_wait)
+    char *program;
+    int in, out;
+    int dont_wait;
+{
+    char   pScript[256];
+
+    strcpy(pScript, program);
+    return chatmain(pScript);
+}
+
+/*
+ * novm - log an error message saying we ran out of memory, and die.
+ */
+void
+novm(msg)
+    char *msg;
+{
+    fatal("Virtual memory exhausted allocating %s\n", msg);
+}